Blasts n g-cartridge



No. 748,935. PATBNTED JAN. 5, 1904.

` T. P. DURHAM. BLASTING CARTRIDGE.

APPLICATION FILED MARA 4. 1903 MMWWW @5mm 5W MOH f No. recess.

Eatented January 5, i904.

THOMAS F. DURHAM, OF PHILADELPHIA, PENNSYLVANA.

SPEGIFGATION forming 'part of Letters Patent No.

SLASTlNGHCARTRlDGE.

748,935, dated January 5, i90/i.

Application filed March 4, i903. Serial No. 146,124. (No model.)

To @ZZ whom. it may concern:

Be it known that i, THOMAS F. DURHAM, a. citizen of the United States,residing at Philedelphie., county of Philadelphia, and State ofPennsylvania, have invented e certain new and useful Improvement inBlasting Cartridges, which following is e specificetier.

bij. in",v `ntion relates to e. new and useful improvement inNesting-cartridges, and reletes to that class of cartridges in which theexplosive is contained within en innex` tube, which inner tube isinserted in en outer cssing, s. reetinguishing egent,sucl1 es Water,surrounding the inner tube upon ell sides; end the object of thisinvention is to con struct e. cartridge which may ne molded and have e.tapering or conical end, end the open end of both the outer end innertube may be sealed by scretwplugs end the fisse or igniting device maypass from the exterior of the outer tube to the interior of the innertube without going through the side ofi the outer tube.

With these ends in View this invention consiste in the details or"construction and cornbinetion of ele nient-s hereinafter set forth endthen speciiicslly designated by the claims.'

in order that those skilled in the srt to which this 'inventionspperteins may understand, how to make and use the some, theconstruction end operation will now be described in detail, referring tothe encompanying drawings, forming e part of this speciiicatiou, inWhichii;J ire l is e longitudinal sectional view of e cartridgeconstructed according to my invention; 2, e pien viewof the cartridge;Fig. 3, e cross-section5 Fig. Li, e. oross-seotion ci the cartridge,showing e modied form of the seme.

A represents the outer tube, which is closed et one end, and this closedend is formed tspering or conical, es represented et A". This conica-tiis for the purpose of allowing the cartridge to oe more easily insertedin the hole drilled in the substance to be blested.

The opposite end of the cuter tube or cylinder A is interiorly threaded,es represented at fr?.

ed, es represented at B. This inner tube is 'adapted to contain theexplosive C and is designed to be held at zt distance from the outertube, tubes is adapted to contain a. fire-extinguish ing agent, such eswater, es represented at D. Thesetuloes may be held seperated in anymanner; but the ineens which I have shown in the drawings consists oi' eseries of projections or ribs E, which are formed with the outer tubeand extend inward therefrom, es shown in Figs. l and 3, and for thepuriu contact with the tapering orconical end A' of the outer tube Iprovide the lugs or projections E', formed with and extending inwardfrom the outer tube, upon which the inner tube rests. The openinteriorly-thresded ends of both the outer tube end the inner tube areadapted to be closed by screw-threaded plugs F and G, respectively. Theopen end or mouth of the outer tube is not of the sume di aineter es thebody of the tube, but is of sutiln cient diameter to allow for theinsertion of the innertuloe. This mouth or open end is formed eccentricto the body of the tube, 'es illustrated upper end of the tube s.shouider H, through which is formed an opening l, sud the fuse passesdownward through this opening and through en opening K, provided throughJthe side of the inner tube. Both the openings I and K ere closed aroundthe fuse with soap, glass, or other suitable materiel to preventleakage. By this construction it will be seen that it is not necessiti-yto forni su opening through the screw-threaded pings for the fuse, andstill the fuse may pese to the inner tube without passing-.through theside of the outer tube, for if the fuse did. pass through the side. ofthe outer tube it might be injured in vinserting the cartridge in thedrilled hole, and by this construction the may be inserted before the'plugs ere placed in the tube.

in 4 l have shown s inodiiicetion wherein the ribs or projections E maybe formed conical instead of Wedge shape. Both the inner and outer tubesare designed to be ii eproci' ine* isi, such es s pose of keeping theinner tube from coming;1

in Fig. 2, and this leaves upon one side of the and the space betweenthe two and also to make the tube stronger, so as to cause moreresistance, and at the same time to be made at a comparatively smallcost.

Of'course do not Wish to be limited to the exact construction hereshown, as slight modiformed tapering or conical, an inner tube alsoclosed at one end, the open end of each tube being interiorly threaded,screw-threaded plugs adaptedA to close said open end, theinteriorly-threaded mouth of the outer tube being formed eccentric withthe body of the tube, the shoulder thus formed upon one side `beingprovided with an opening extending to the interior of the tube, theinner tube being providedl Withan opening through its side, a fuseadapted to extend from the exterior of the cartridge through saidopening to the iuterior of the inner tube, and the holes adapted to beclosed around the fuse by a plastic yWaterproof solution, projectionsextending inward from the outer tube to hold the inner tube at adistance from the outer tube, and projections extendinginward from theconical end of the outer tube upon which the inner tube is adapted torest3 as and for the purpose specied.

2. In a safetyblasting-cartridge, an outer tube closed at one end, saidclosed end being formed tapering or conical, an inner tube also closedat one end, means for holding the inner tube at a distance from theouter tube, the open end of each tube being interiorly threaded, sore'rr-threaded plugs adapted to close said open ends, theinteriorly-threaded mouth of the outei` tube being formed eccentric withthe body cf the tube, the shoulder thus formed upon one side beine.rprovided with an opening extending to the interior of the tube, theinner tube provided with an opening through its side, a fuse adapted toextend from the exterior of the cartridge through said openings to theinteri er of the inner tube, and the holes adapted to be closed aroundthe fusev by a plastic Waterproof solution, said inner and outer tubesadapted to be molded from a fireproof substance, as and for the purposespecied.

3. In a safety blasting-cartridge, an inner and outer tube projectionsextending inward from the outer tube, said lprojections adapted to holdthe inner tube at a distance from the outer tube, said inner and outertube and projections being Inolced from a material composed of a mixtureet cement and silica, or like substance, as and for the purpose specied.

ln testimoni,T wherec'i l have hereunto afxed my signature in thepresence of two subscribing witnesses.

THOMAS r. DURHAM.

Witnesses:

MARY E. HAMER, L, W. MORRISON.

